SME: Deauthenticate to clear state after disassociation events

cfg80211/mac80211 can get into somewhat confused state if the AP only
disassociates us and leaves us in authenticated state. For now, force
the state to be cleared with deauthentication to avoid confusing errors
if we try to associate with the AP again. This gets rid of 30 second
delay (scan timeout) in cases where only a disassociation frame is
received from the AP.

wpa_supplicant/events.c

@@ -1383,8 +1383,10 @@ void wpa_supplicant_event(void *ctx, wpa_event_type event,
 	case EVENT_ASSOC:
 		wpa_supplicant_event_assoc(wpa_s, data);
 		break;
-	case EVENT_DEAUTH:
 	case EVENT_DISASSOC:
+		sme_event_disassoc(wpa_s, data);
+		/* fall through */
+	case EVENT_DEAUTH:
 		wpa_supplicant_event_disassoc(wpa_s);
 		break;
 	case EVENT_MICHAEL_MIC_FAILURE:

wpa_supplicant/sme.c

@@ -427,3 +427,23 @@ void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 	wpa_supplicant_mark_disassoc(wpa_s);
 	wpa_supplicant_req_scan(wpa_s, 5, 0);
 }
+
+
+void sme_event_disassoc(struct wpa_supplicant *wpa_s,
+			union wpa_event_data *data)
+{
+	wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
+	if (!is_zero_ether_addr(wpa_s->bssid) &&
+	    !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
+		/*
+		 * cfg80211/mac80211 can get into somewhat confused state if
+		 * the AP only disassociates us and leaves us in authenticated
+		 * state. For now, force the state to be cleared to avoid
+		 * confusing errors if we try to associate with the AP again.
+		 */
+		wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
+			   "state");
+		wpa_drv_deauthenticate(wpa_s, wpa_s->bssid,
+				       WLAN_REASON_DEAUTH_LEAVING);
+	}
+}

wpa_supplicant/sme.h

@@ -28,6 +28,8 @@ void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
 			      union wpa_event_data *data);
 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 			       union wpa_event_data *data);
+void sme_event_disassoc(struct wpa_supplicant *wpa_s,
+			union wpa_event_data *data);
 
 #else /* CONFIG_SME */
 
@@ -64,6 +66,11 @@ static inline void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 {
 }
 
+static inline void sme_event_disassoc(struct wpa_supplicant *wpa_s,
+				      union wpa_event_data *data)
+{
+}
+
 #endif /* CONFIG_SME */
 
 #endif /* SME_H */